WO1985003555A1

WO1985003555A1 - Apparatus for use in the injection or application of a filling, binding or coating composition consisting of two components

Info

Publication number: WO1985003555A1
Application number: PCT/DK1985/000008
Authority: WO
Inventors: Anders Erreboe Bundgaard
Original assignee: Hans Jo^/rgensen & So^/n Entrepreno^/rer AS
Current assignee: Hans Jo^/rgensen & So^/n Entrepreno^/rer AS
Priority date: 1984-02-13
Filing date: 1985-02-13
Publication date: 1985-08-15
Anticipated expiration: 1986-08-13
Also published as: DK63784A; EP0170687A1; DK63784D0

Abstract

An apparatus for use in the application of a binding composition consisting of two components has two pumps (2 and 3) of different capacities. One pump (2) is connected with a source (20) of one component and the other pump (3) is connected with a source (21) of the other component. The two pumps (2 and 3) are connected with a mixing device (23) for mixing the two components. To avoid the necessity of cleaning the apparatus each time it has been used, and to obtain a correct dosage of the two components, each of the two pumps consists of a piston pump (2 and 3). The proportion between the interior cross-sectional areas of the cylinders of the two pumps (2 and 3) corresponds to the desired mixing proportion between the two components. Moreover, the cylinders of the two pumps (2 and 3) are connected, at the side of their pistons (4 and 5) facing away from the pressure chambers of the cylinders, with a source (26, 27) of an inhibitor serving to prevent the penetration of air into the apparatus. Moreover, the pistons (4 and 5) of the two pumps are connected with a common yoke (8).

Description

Apparatus for use in the injection or application of a filling, binding or coating composition consisting of two components.

The invention relates to an apparatus for use in the inject¬ ion or application of a filling, binding or coating composition consist- ing of two components, said apparatus comprising two pumps having different capacities, one of said pumps being connectable to a source of one component, the other pump being connectable to a source of the other component, the two pumps being connectable to a mixing device for mixing the two components. Apparatuses of this kind are known on the market. In these known apparatuses the pumps are in the form of electrically operated rotary pumps. Such electrically operated rotary pumps tend to make the apparatus large and inconvenient to handle. A further drawback is that, while the capacities of such rotary pumps can be varied by changing their stroke or frequency or both, it has been found in practice that it is difficult to obtain an accurate dosage so that the desired mixing proportion is really secured. This is probably due to the fact that^, the components here considered can have very different viscosities. Moreover, these known apparatuses require careful ciean- ing after use, which is especially the case when one component is a resin and the other component is a hardener.

The apparatus according to the present invention is charac¬ terized in that each of the two pumps consists of a piston pump, that the proportion between the interior cross-sectional areas of the cylin- ders of the two pumps corresponds to the desired mixing proportion between the two components, that the cylinders of the two pumps are connectable, at the side of their pistons facing away from the pressure chambers of the cylinders, to a source of an inhibitor, and that the pistons of the two pumps are connected with a common yoke. Hereby the above mentioned problems are solved because the said proportion between the cross-sectional areas of the cylinders of the two pumps secures that the apparatus doses the two components correctly, viz. by equal displacement of the two pistons, which is secured by the yoke. Normally, one would be reluctant to use piston pumps because these are difficult to clean, but owing to the use of the inhibitor air is prevented from penetrating into the pumps considered, and thereby any residues of the components in the pumps are prevented from har¬ dening, and the inhibitor, which thus prevents the admission of air. ensures that the apparatus can be used even if it has been out of use for some time. Thus, in the present context, the word "inhibitor" is intended to signify an agent which prevents the component present . in the respective pump from hardening.

5 Since the components considered, and particularly a resin, may have very high viscosities (up to 700-900 cp. in the case of a resin), an embodiment of the invention is proposed which is characteri¬ zed in that the apparatus has an operating mechanism consisting of a spindle with a handle, the spindle being connected to the yoke at a

10. position of the latter such that the proportion between the distances between the spindle and each of the piston rods corresponds to the desired mixing proportion. Hereby the equal displacement of the pi¬ stons is facilitated, and a suitable distribution of forces is obtained. In order to facilitate the operation of such an operating mechanism,

15 the handle may be connected with the spindle by way of a ratchet device.

Since it may be desirable to be able to clean the pumps. It is preferred to use pumps without any actually built-in valve mecha¬ nism in the form of a suction valve and a pressure valve, that may

20 both be spring-biased. Based on this consideration, an embodiment of- the invention is proposed, which is characterized in that the valve mechanisms of each of the two piston pumps consists of manually ope¬ rable three way cocks separate from the pumps. Such a cock arrange¬ ment is very reliable, whereas the use of spring-biased valves may,

25 particularly in the case of liquids of high viscosity, give rise to trouble in the way of failure to close at the beginning of the pressure stroke of the pump considered.

In the apparatuses mentioned in the beforegoing it is known to connect the pumps with the mixing device by means of hoses.

30 These can be rather long. The length of the hoses, in combination with a possible difference of viscosity of the two components, may have the effect that the hoses between the two pumps and the mixing apparatus may become differently expanded, whereby the mixing proportion may be distorted because one hose will take up a larger

35 volume than the other. To remedy this drawback an embodiment of the present Invention is proposed, which Is characterized in that the apparatus is constructed for the connection of more than one hose between the pump having the larger capacity and the mixing device, and that the proportion between the number of hoses between the pump having the larger capacity and the mixing device, on one hand, and the number of hoses between the pump having the smaller capaci¬ ty and the mixing device, on the other hand, substantially corresponds to the desired mixing proportion .

The invention will now be further explained with reference to the drawing, which diagrammatical ly illustrates an embodiment of the apparatus according to the invention .

In the drawing, 1 is a frame to which two piston pumps 2 and 3 are attached . The apparatus illustrated is adapted to deliver a mixture consisting of two components in the mixing proportion 2: 1 . Thus, in the embodiment illustrated in the drawing, the pump 3 is adapted to deliver two parts of a resin and the pump 2 is adapted to deliver one part of a hardener. To achieve this, the proportion be- ween the interior cross-sectional area of the cylinder of the pump 3 and the interior area of the cylinder of the pump 2 is equal to the mixing proportion, or in other words the cylinder of the pump 3 has a cross-sectional area twice that of the cylinder of the pump 2. Thereby the desired mixing proportion can be obtained by displacement of the same size of the pistons 4 and 5 of the two piston pumps. In order to secure such equal displacement of the two pistons, the piston rods 6 and 7 of these are connected with a common yoke 8. This is movable by means of an operating mechanism, which in its entirety is denoted by 10, and which consists of a spindle 11 threadedly engaged in an internally threaded sleeve 12, which is attached to the frame 1 . The outer end of the spindle 11 is rotatably, but nondisplaceably and nontiltably mounted in the yoke 8, and the end of the spindle extending outwards from the yoke is provided with a handle 15 which is connected with the spindle 11 by means' of a ratchet device 16. The position 17, at which the spindle 11 is connect- - ed with the yoke, has different distances from the piston rods 6 and 7, viz. such that the proportion between these distances corresponds to the reciprocal of the mixing proportion, thus, in the present case 2: 1 . I n other words, the distance between the position 17 and the piston rod 6 is twice the distance between the position 17 and the piston rod 7, so that a force exerted by the spindle 11 will be distri¬ buted in such a manner that the force in the piston rod 7 becomes twice the force in the piston rod 6, thus corresponding to the propor- tion between the cross-sectional areas of the two cylinders, provided, however, that the same pressure is to be used in the two pumps.

Each pump is provided with a separate valve mechanism in the form of a three way cock 18 and 19, respectively. One inlet of each of these is connected with a source, viz. a container 20 and a container 21 , respectively. In the case considered the container 20 contains a hardener and the container 21 a resin, and when these two components are mixed, a self-hardening mixture is obtained which can be used for the injection e.g . into cracks in a concrete structure, for the coating of objects, for the adhesive bonding of objects or for other purposes where such mixtures are used . In the case considered, the apparatus is intended for use to inject the mixture In question into cracks in a concrete structure. To illustrate this, a mixing device 23, which Is connected to the pumps 2 and 3, Is provided with a thin injection tube 24. The mixing device as such consists in a manner known per se of a housing in which a pin provided with mutually crossing screw threads is mounted.

The illustrated embodiment of the apparatus also comprises two containers 26 and 27 connected with the piston pumps 2 and 3, respectively, at the ends of these facing away from the pressure chamber of the pumps. Each of these containers 26 and 27 contains an inhibitor which in the case considered is constituted by an oil . It will be understood that, instead of two containers 26 and 27, a single container common to the two pumps can be used . It will be realized that when the pistons 4 and 5 are pushed forwards by means of the operating mechanism 10, the rear side of the pistons will suck oil into the rear ends of the cylinders of the pumps to fill up these so as to prohibit the admission of air. At the same time an inhibitor in the form of an oil will effect a suitable lubrication of the stuffing boxes through which the piston rods 6 and 7 pass . However, ail that is required is to use an Inhibitor which inhibits the admission of air to the pistons of the pumps and prevents hardening of the components present in the pumps.

The pumps 2 and 3 are connected with the mixing device 23 by means of hoses 29, 30 and 31 of the same size. In the embodiment illustrated, the three way cock 18 is connected with the mixing device 23 by means of one hose 29 only, while the three-way cock 19 is con¬ nected with the mixing device by means of two hoses 30 and 31 in parallel . It will thus be understood that the apparatus is constructed for the connection of more than one hose between the pump 3 having the larger capacity and the mixing device 23, and that the proportion between the number of hoses between the pump having the larger ca- 5 pacity and the mixing device, on one hand, and the number of hoses between the pump having the smaller capacity and the mixing device, on the other hand , substantially corresponds to the desired mixing proportion . Hereby the advantage is obtained that if the same pressure prevails in all three hoses, these will be uniformly expanded, and 10 consequently the proportion between the expansions of the two hoses 30, 31 and the expansion of the hose 29 will correspond to the mixing proportion , whereby certainty is obtained that in spite of the expansion of the hoses the components are supplied to the mixing device in a correct mixing proportion . 15 The two hoses 30, 31 are connected in parallel by means of two breech-pipes 33 and 34, of which the latter is connected with an additional breech-pipe 35 via a stop cock 36. The hose 29 is connected with the last mentioned breech-pipe by means of a corresponding stop cock 37 and the breech-pipe 35 is again connected with the mixing 20 device 23.

For monitoring the pressure on the resin side, a manometer 39 is provided Immediately following the three-way cock 19. The apparatus illustrated operates as follows: When the pumps 2 and 3 are to be filled, the pistons 4 and 25 5 are withdrawn by means of the operating mechanism 10, and in this phase the two three-way cocks 18 and 19 are so set that a suction takes place from the containers 20 and 21 , respectively, into the pump cylinders. At the same time, the rear side of the pistons will expell oil from the pumps into the containers 26 and 27. When the 30 pumps are filled, the two three-way cocks are reset in such a manner as to establish communication between the pumps and the mixing ^ device, it being assumed that the two stop cocks 36 and 37 are open . _t At the same time the connections to the two containers 20 and 21 are interrupted. Now the pistons 4 and 5 are moved forwards in the pump 35 cylinders by using the operating mechanism 10, and as previously explained a uniform mixing proportion is obtained in the mixing device 23. During this dosage stroke oil will be sucked in behind the pistons so that the previously explained effect, viz. the avoidance of solidifica¬ tion or hardening of the two components, is obtained .

Claims

Patent Claims.

1. Apparatus for use in the injection or application of a fil¬ ling, binding or coating composition consisting of two components, said apparatus comprising two pumps (2 and 3) having different capacities, one of said pumps being connectable to a source (20) of one component, the other pump being connectable to a source (21) of the other component, the two pumps (2 and 3) being connectable to a mixing device (23) for mixing the two components, c h a r a c t e r i ¬ z e d in that each of the two pumps consists of a piston pump (2 and 3, respectively), that the proportion between the interios cross- sectional areas of the cylinders of the two pumps (2 and 3) corresponds to the desired mixing proportion between the two components, that the cylinders (2 and 3) of the two pumps are connectable, at the side of their pistons (4 and 5) facing away from the pressure chambers of the cylinders, to a source (26, 27) of an inhibitor, and that the pistons (4 and 5) of the two pumps are connected with a common yoke (8).

2. Apparatus according to claim 1, c h a r a c t e r

I z e d in that the apparatus has an operating mechanism (10) consϊst- ing of a spindle (11) with a handle (15), the spindle (11) being connected to the yoke (8) at a position (17) of the latter such that the proportion between the distances between the spindle (11) and each of the piston rods (6 and 7) corresponds to the desired mixing proportion .

3. Apparatus according to claim 1, c h a r a c t e r i z e d in that the valve mechanisms of each of the two piston pumps (2 and 3) consists of manually operable three-way cocks (18 and 19, respecti¬ vely) separable from the pumps (2 and 3).

4. Apparatus according to claim 1, in which each of the pumps (2 and 3) is connectable with the mixing device (23) by means of hoses, c h a r a c t e r i z e d in that the apparatus is construc¬ ted for the connection of more than one hose (30, 31)- between the pump (3) having the larger capacity and the mixing device (23), and that the proportion between the number of hoses (30, 31) between the pump having the larger capacity and the mixing device (23), on one hand, and the number of hoses (29) between the pump (2) having the smaller capacity and the mixing device (23), on the other hand, sub¬ stantially corresponds to the desired mixing proportion.